Joshua Brown’s YouTube channel is almost completely dedicated to his experiences of driving his Tesla Model S using the vehicle’s Autopilot system – a system of sensors and controls which make the car able to drive without the person in the driver’s seat holding the wheel or touching any other controls.

One video in particular gives a visceral example of these new technologies possibly saving him from injury, while definitely saving the car from damage. Brown is in his Tesla Model S on an Interstate when the vehicle’s autopilot system avoids a truck which, having apparently not seen…